"The results [of a western australia research program on cell phone usage while driving] showed that drivers' use of a cell phone within a period up to 10 minutes before the time of the crash was associated with a fourfold greater risk of crashing. The risk associated with using a handheld cell phone was only slightly higher than the risk associated with using a hands-free device (4.9 vs. 3.8 times increased risk). This increase in crash risk associated with cell phone use was found regardless of the sex or age of the driver."
In a Australian study of roughly 460 people, ages 17 and up, it was found that after about ten minutes of cell phone conversation/usage, the subjects' chances of getting into a serious automobile accident had gone up four times the average. However, contrary to popular belief, Hands free devices did not reduce that risk significantly (from 4.9 times average to 3.8 times with hands free).
[Studies have shown that the behavior that increases your risk of getting into an accident stem from your state of mind and distraction while talking to someone. For example, when speaking to someone over the phone, you are trying to focus on the conversation, so your observational skills and your reaction time are both cut quite significantly.]
"Cell Phone Use While Driving Ups Crash Risk." Study Shows Risk Similar for Handheld and Hands-Free Phones (2005): n. pag. Web. 11 Nov 2010. <http://men.webmd.com/news/20050712/cell-phone-use-while-driving-ups-crash-risk>.
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